Last year I used these things in this thread but I've decided to go another direction this year.
I'm using our old swing set monkey bars that has room for 4 or 5 hives as a stand, therefore I only need 4 barriers.
Here's what you need...
4 cake pans or pie tins. Don't get non-stick.
4 4x4x4 blocks of wood.
and a place to apply the NeverWet.
I put a hole in the center of the pans so I could hang the pans to spray them and drive a screw through to mount them.
mount the pans on a board/cardbord or something.
spray them with NeverWet
screw them to the blocks
and place one under each corner